java读取文件大小，java文件大小,public stati

java读取文件大小，java文件大小,public stati

public static void main(String[] args) {        String src = "c://test.apk";        File file = new File(src);        DecimalFormat df = new DecimalFormat("0.00");        String fileSizeString = "";         if (file.length() < 1024) {            fileSizeString = df.format((double) file.length()) + "B";        } else if (file.length() < 1048576) {            fileSizeString = df.format((double) file.length() / 1024) + "K";        } else if (file.length() < 1073741824) {            fileSizeString = df.format((double) file.length() / 1048576) + "M";        } else {            fileSizeString = df.format((double) file.length() / 1073741824) + "G";        }         System.out.println("==========>"+fileSizeString);    }